ANAT.3601

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Author:
xiongav
ID:
129078
Filename:
ANAT.3601
Updated:
2012-01-19 21:13:22
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Tissue levels Organization
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Description:
Tissue levels of Organization
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  1. Define TISSUES.
    A group of similar cells & extracellular products that carry out common functions.
  2. Define HISTOLOGY.
    The study of tissues & their relationships within organs.
  3. What are the four tissue types in the body?
    • 1) Epithelial
    • 2) Connective
    • 3) Muscle
    • 4) Nervous

    (Tissue)
  4. Tissues are formed from what 3 primary germ layers?
    • 1) Ectoderm ("ecto" = outside/external; "derm" = skin)
    • 2) Mesoderm
    • 3) Endoderm
  5. What does the EXTRACELLULAR MATRIX, compose of?
    Water, protein fibers, and dissolved macromolecules.
  6. What is the EPITHELIAL TISSUE?
    Covers or lines every body surface and all body cavities.

    Forms internal/external lining of many organs

    *NO blood vessels penetrate epithelial cells.
  7. Characteristics of EPITHELIAL TISSUE.
    Describe:

    Cellularity
    Polarity
    Attachment
    Avascularity
    Innervation
    High regeneration capacity
    Cellularity: ET is almost all cells.

    Polarity: free/top surface, fixed/bottom surfaces.

    Attachment: Bound to thin basement membrane.

    Avascularity: All EC lack blood vessels (none can penetrate)

    Innervation: Environment detection.

    Regeneration: frequently damaged but replaced similarly.
  8. Functions of Epithelial Tissue.

    Physical protection
    Selective Permeability
    Secretions
    Sensations
    Physical protection: ET protect both exposed & internal surfaces from dehydration, abrasion, and destruction.

    S. Permeability: All E. cells act as "gatekeepers".

    Secretions: secretion through Exocrine glands.

    Sensations: Detect changes in the external environment..
  9. Describe the basement membrane, its origins, and its functions.
    A thin extracellular layer between the connective tissue & the epithelium.

    Functions to form a molecular barrier between the epithelial and connective tissue.

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